Abstract:

To evaluate residues dynamics of Beta cypermethrin in Lycium, field trail for Beta cypermethrin residue in Lycium was conducted in Ningxia, Qinghai and Xinjiang. The results showed that the residues and degradation dynamics of Beta cypermethrin in Lycium conformed completely to the equation of first-class reaction kinetic. The half-life of degradation for Beta cypermethrin was 5.2-6.5 days in Lycium berry, 4.8-8.8 days in Lycium, According to the recommended dosage, the final residue ranged from 0.0108 to 0.460 mg/kg of Beta cypermethrin in Lycium. The maximum residue limit was recommended 1 mg/kg in Lycium.